java通过串口读取数据

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最近要做一个项目，接口数据可能通过RS232串口给我们传过来，所以就事先学了一下java如何通过串口接收数据，怕自己忘了，所以记录下来。

java操作串口是通过RXTX实现的，可以从http://fizzed.com/oss/rxtx-for-java下载。

安装说明：

Windows

RXTXcomm.jar goes in \jre\lib\ext (under java)
rxtxSerial.dll goes in \jre\bin

Mac OS X (x86 and ppc) (there is an Installer with the source)

RXTXcomm.jar goes in /Library/Java/Extensions
librxtxSerial.jnilib goes in /Library/Java/Extensions
Run fixperm.sh thats in the directory. Fix perms is in the Mac_OS_X
subdirectory.

Linux (only x86, x86_64, ia64 here but more in the ToyBox)

RXTXcomm.jar goes in /jre/lib/ext (under java)
librxtxSerial.so goes in /jre/lib/[machine type] (i386 for instance)
Make sure the user is in group lock or uucp so lockfiles work.

Solaris (sparc only so far)

RXTXcomm.jar goes in /jre/lib/ext (under java)
librxtxSerial.so goes in /jre/lib/[machine type]
Make sure the user is in group uucp so lockfiles work.

代码如下

package comm;

import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.io.IOException;
import java.io.InputStream;

/**
* Java 操作串口读取数据
* @author suyunlong
*
*/
public class SerialComm
{
/**
* 打开串口
* @param portName 串口名
* @param waverate 波特率
*/
public void connect(String portName,int waverate)
{
  CommPortIdentifier portIdentifier=null;
  try
  {
   portIdentifier=CommPortIdentifier.getPortIdentifier(portName);
   if(portIdentifier.isCurrentlyOwned())
   {
    System.out.println("Error: Port is currently in use");
   }
   else
   {
    CommPort commPort=null;
    commPort=portIdentifier.open(this.getClass().getName(), 2000);
    if(commPort instanceof SerialPort)
    {
     SerialPort serialPort=(SerialPort)commPort;
     serialPort.setSerialPortParams(waverate,SerialPort.DATABITS_8, SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
     InputStream in=serialPort.getInputStream();
     serialPort.addEventListener(new SerialReader(in));
     serialPort.notifyOnDataAvailable(true);
    }
   }
  }
  catch(Exception e)
  {
   System.out.println(e.getMessage());
  }
}
/**
* 处理输入来自串行端口，启动一个监听器
* @author suyunlong
*
*/
public static class SerialReader implements SerialPortEventListener
{
  private InputStream in;
  private byte[] buffer=new byte[1024];
  public SerialReader(InputStream in)
  {
   this.in=in;
  }
  public void serialEvent(SerialPortEvent arg0)
  {
   int data;
   try
   {
    int len=0;
    while((data=in.read()) > -1)
    {
     if(data=='\n')
     {
      break;
     }
     buffer[len++]=(byte)data;
    }
    System.out.println(new String(buffer, 0, len));
   }
   catch(IOException e)
   {
    System.out.println(e.getMessage());
    System.exit(-1);
   }
  }
}
public static void main(String[] args)
{
  (new SerialComm()).connect("COM1",57600);
}
}

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